Product Category
| Product Category | Longitudinal Welded Steel Pipes |
| Core Product Definition | Straight-seam welded steel pipes formed by rolling steel plates/strips into a cylindrical shape and welding the longitudinal seam, available in standard and custom specifications |
| Key Production Process | 1. Raw Material Slitting → 2. Roll Forming → 3. Continuous Longitudinal Welding → 4. Seam Leveling & Inspection → 5. Sizing & Straightening → 6. Hydrostatic Testing → 7. Cutting & Surface Treatment |
Main Product Specifications
| Main Product Specifications | Details |
| Outer Diameter Range | 21.3mm – 1626mm (1/2" – 64") |
| Wall Thickness Range | 1.0mm – 60mm (0.04" – 2.36") |
| Standard Length | 6m/12m, custom cut-to-length available |
| Applicable Material Grades | Q235, Q355, A53, A106, GR.B, ST37, ST52 |
| Surface Treatment Options | Black painting, anti-rust oil, galvanized coating, 3PE/PP epoxy coating, varnish |
Core Advantages Compared to Other Steel Pipes
| Core Advantages Compared to Other Steel Pipes | Advantages Details |
| Dimensional Precision | Higher straightness and tighter diameter tolerance than seamless pipes, suitable for structured engineering applications |
| Production Efficiency | Faster mass production, lower manufacturing cost, large diameter large batch orders can be delivered on short lead time |
| Seam Performance | Advanced welding and post-weld heat treatment ensures stable seam strength, no hidden leakage risk |
| Customization Flexibility | Easy to adjust size, material and coating for special project requirements |
Main Application Scenarios
| Main Application Scenarios | Specific Usage |
| Infrastructure & Construction | Urban water supply pipelines, drainage systems, bridge piling, construction support frame |
| Oil & Gas Industry | Low-pressure oil transmission, natural gas distribution pipeline networks |
| Mechanical & Manufacturing | Structural pipe for machinery, vehicle manufacturing, container production |
| Green Energy | Wind power tower components, photovoltaic support structure, new energy project framework |
| Chemical Industry | General industrial fluid transmission, wastewater treatment pipelines |
Quality Control & Certifications
| Quality Control & Certifications | Items |
| Non-Destructive Testing | Hydrostatic pressure test, ultrasonic weld testing, X-ray flaw detection |
| Available Certifications | API 5L, ASTM A500, GB/T 3091, ISO 9001, CE |
| Custom Inspection | Third-party inspection (SGS/BV) accepted per customer requirements |
Export & Supply Capability
| Export & Supply Capability | Details |
| Minimum Order Quantity | 1 ton (stock size), 5 tons (custom size) |
| Supply Capacity | 30000 tons per month |
| Packaging | Standard export seaworthy packaging, bundled with steel strips, can add protective caps on both ends |
| Delivery Time | 7 – 15 days for stock sizes, 20 – 30 days for custom production |
| Common Payment Terms | T/T, L/C at sight, trade assurance |
Actual Export Transaction Case: Carbon Steel Longitudinally Welded Steel Pipes
| Transaction Attribute | Specific Details |
| Case Reference No. | LW-CS-EX-2025-BR |
| Import Country/Port | Brazil, Paranaguá Port |
| Buyer Type | Local construction engineering contractor |
| Product Name | Longitudinally Welded Carbon Steel Pipes |
| HS Code (Mercosur Customs) | 73043190 |
| Material Grade | ASTM A53 GRB Carbon Steel |
| Outer Diameter | 219 mm |
| Wall Thickness | 6 mm |
| Standard Length | 12 m/piece |
| Total Quantity | 4,250 pieces |
| Total Net Weight | 218.5 tons |
| Order Confirmation Date | Jan-25 |
| Shipment Delivery Date | Apr-25 |
| Trade Term | FOB Tianjin |
| Payment Method | 30% T/T deposit, 70% L/C at sight |
| Delivery Lead Time | 22 days after deposit received |
| Core Successful Experience | Passed 100% hydrostatic pressure test and met local mechanical property standards; provided complete set of origin and trade documents to ensure smooth customs clearance. |
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Address: Chenda Road,Daqiuzhuang Town Jinghai County,Tianjin,China.
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